Cartridge for ordnance.



No. 703,879. Phtented July I902.

A. WBATZKE.

CARTRIDGE FOR OBDNANCE.

(Application filed Apr. 27, 1901.) (No Model.)

Fig.1 c

g s a 4 A WITNESSES: iNVE NTOR;

- A-TTORNEY.

UNITED STATES Y PATENT OFFICE.

ALFRED WRATZKE, OF RUTTENSOHEID, GERMANY, ASSIGNOR TO FRIED. KRUPP, OF ESSEN, GERMANY.

CARTRIDGE FOR ORDN'ANCE.

SPECIFICATION forming part Of Letters Patent NO. 703,879, dated July 1, 1902.

Application filed April 27, 1901. Serial No. 57,646. (No model.)

To all whom it may concern:

Be it known that I, ALFRED WRATZKE, a citizen of the German Empire, residing at 149 Essenerstrasse, Ruttenscheid, near Essen-onthe-Ruhr, Germany, have invented certain new and useful Improvements in Cartridges for Ordnance, of which the following is a specification.

The present invention has reference to improvenients in cartridges for ordnance, and has for its object to prevent entrance of gases between the cartridge-case and the cartridgechamber. This object is accomplished by havingat least one of the driving-bands of I5 the projectilem wit, the one nearest to the cartridge-casearranged to engage with an.

enlargement at the mouth of said case.

The nature of my invention will best be understood when described in connection with the accompanying drawings, in which Figure 1 represents a cartridge constructed according to my invention, part of the case and the breech being shown in section. 2 is a detail sectional view, on an enlarged scale, of part of Fig. 1.

Similar letters of reference designate corresponding parts throughout the several views of the drawings.

Referring to the drawings, the letter A designates the cartridge-case, which is provided at its mouth with an enlarged or expanded portion a, which forms a collar projecting outwardly beyond the cylindrical body of the case. This enlarged portion is 5 of such diameter that it leaves just sufficient clearance for the introduction of the cartridge between the projectile and the wall of the cartridge or breech chamberD of the gunbarrel. The driving-band C of the projectile B is provided with a shouldered part c, which is forced into the enlarged portion a of the case A. When theprojectileB is forced into the cartridge-case, the shoulder a of the driving-band strikes against the front edge a of the enlarged part of thecase, thus limiting the introduction of the projectile. Upon firing, the propelling-gases before the projectile begins to move expand first that part of the cartridge-case which is situated below Fig.

the base of the projectile and then take their 5 way between the interior wallof the case and the part of the projectile below the drivingband C, expanding thus also this part of the cartridge-case,so as to closely press the rounded edge a against the walls of the cartridgechamber. When the projectile begins to move, the gases then bring the outer surface of the enlarged portion a of the case into contact with the barrel. This contact, as numerous trials have proved, remains permanent" during the further movement of the projectile, so that entering of gases into the clearance between the cartridge-case and the cartridge-chamber is prevented, and the disadvantages resulting from such entering-as smutting of the cartridge-chamber and the breech-closing mechanism, loss of gas, and consequently irregularities in the initial velocity of the projeotilesare thereby entirely avoided.

It is not essential that the driving-band 0 should have a shoulder c, as it may be formed in any other suitable mannerfor instance, as indicated in dotted lines in Fig. 2. Then in inserting the projectile into the cartridgecase care must be taken not to force the proj ectile too far into the case. The shoulder 0 may also be dispensed with by causing the driving-band to abut against the shoulder at the bottom of the enlarged portion a' of the cartridge-case. The driving-band may also be entirely inserted into a correspondinglydeepened enlarged portion a. When the proj ectile is provided with several driving-bands, they may all be brought within the enlargement of the cartridge-case, or only the one nearest to the case.

What I claim as new is- 1. A cartridge for ordnance comprising a projectile having one or moredriving-bands and a case having an enlargement at its mouth into which one or more of said-bands are inserted and the outer wallof the case adjacent to the enlargement being adapted to engage with the surrounding bore of the barrel, substantially as and for the purpose specified.

2. A cartridge for ordnance comprising a projectile having one 01' more driving-bands and a, case having an'enlargenient at its my hand in the presence of two subscribing mouth into which one of said bands is insertwitnesses.

ed, and said inserted band being provided I ALFRED VVRATZKE.

In testimony whereof I have hereunto set with a shoulder adapted to rest upon the WVitnesses: outer edge of the cartridge-case, snbsmntiall y WILLIAM EssENWEIN,

as described. 1 P. UMBER. 

